Ceiling board jack



Feb. 28, 1950 1. SELLERS 2,499,005

CEILING BOARD JACK Filed Aug. 28, 1947 2 Sheets-Sheet 1 INVENTOR. fra SeZZeTgs x. SELLERS CEILING BOARD JACK Fb. 2s, 195o 2 Sheets-Sheet 2 Filed Aug. 28, 1947 I lll. TII.

AIMIMIM-Ml.

INVENTOR. fra Sellers its lower end. to'.;therhase :1,L angnpper Patented Fei). 28, 1950 ,UN 1 rfa-o STM-fes OFF ici-E GzBOAItDiIAGK "Ira Sellers ;Wa1la'Wal1a, Wash. ApplicatomA-ugustyZS, llwtserial No.;l' 1,ll0

The .invention aims to provide an efective,

durable and safe 4,jackenabling one man to,1ift

sheets of ceiling board and vhold them inypl'ace .Whilefthey are being nailedgandin carrying out this end, a further,Objectis-,to,provide.;a. .iack f whichis notonly extensible andwretractabledne toitheprovision of telescoped standard seclons, but due to :the provisioniofy vertically tadlustable klegs for a vlease which supports thefstandardf `tion on line 3- 3 ofi-Eig, ;Figs. 4 and 5 aire horizontal sectionalviewis; on Ithe correspondingly numbered linesY ofFig-.z `3.

Eig. `6 is a vhorizontal: sectional view online A preferred construction has.r beenfillustratd .inthe drawingspand will befrat-her specifically described, but itis to be understoodgthat'. within the scope of the invention 'as claimedfnumereus .minor variations mayhemade kA horizontal ,base 1- is iprovidedlhaving. Nerticallyadjustable legs 8,-,: -sai d legs having casters 8 allowing the. entire devioeto ghe; rea'dilyfmowe'd into proper position.; upon :a ioo :andalsoiner y mittingit to2berolleddromnonerr c1-1n: wither. A lowerztuleular standard.: section is secured-zat ismade vfor*raisingiualsld'lowering thefzsectionflll i Aand f for holding itA in yadjusted position.v

The llease f1. includes afiativ horizontal rectangul- -lar framevlzzhavingparallel side-hars lf3-and parallel endr bars M integrally '.joined :.to1each other, saidvzframe being rectangular as shownzxin `Fg.f6. The.: side andlenol bars lf3 and-slid mat7 -well be formed .from Vtwof lengths-affilata ,or daar metal bent into U;shape :and ha-ving theirfends vsecured together Aby splice plates? :1:5 -fri'vetedior otherwise secured: in place'atfythe f centers'aof the side ibars: I3.

AS'Ihelegs `8 Whichiare formedofzrectangltlar vertically within the-corners ofzthe fran 1e. l .2,

and angular yyoke plates .IGfengagethe utma'ern.

sides of` said legs and are -securedtoithea1alme side and end bars by bolts or the; like" H. =Wllen these bolts' are loosened, theframe l2 zmafyffhe vertically,y adjusted :with respect .to ,the legs`8, an d .said frame and;` legs@ .ma-y be i thengelampedfand;

tandem relatonfwthfeaeh: oth below the lcellar 29. ably secured f .to and .projects downwardly y,from fthe ,-bar 30, and vlille lower A:endl of :thi-S plate is --36 and. Ais mountedlnpont 2 lockediaeainstrrelativefmevementby tightening saijdbolts.

In Ythef,constructien shown, the upper-edges of the splice A1plates l5 are provided Iwith ,in- ,wardl-y tprojecting horizontal f anges .I8 upon .whichia-transverse horizontal-plate .I9 is secured by boltsA or the like 211:.- Onev oiilihese bolts also secures the lov/ er endu o'ffaninclined standard brace -2 l and-,anothersimi-lar:brace A2.;2 .is secured by aboli: or thelile 23- toa,bracket 2.4 riveted or otherwise.secured-toeneiof l the end 4laars I4 of 'the baseframe t2.

The tubular lower .standard section` :9V `includes -two' longitudinal semifeylindrical halves f 2.5 having dan-ges 2 6 at their lower ends riveted f or otherwise secured tov the ,transverse plate' le. jflhe longitudinaledgesoi the `halvesyZE are. spaced .apart tio-provide the `lower standar-d section Yil `.witl'i two ydia-meimieallyopposedslots '2'! and 28, sahd-:theupper ends ofisafid-:halves Hare-riveted orzotherwisefsecureditoacellar 29. The upper enjd of the-lorace 22 f issecuredtoithiscollar and the upperend of brace 2l may be suitably seeuredgtoonefef t he-;halves 125. This collar is anfintemalfnotch 2,9" vv vipder than communicating .with the latte-r, for a :purpose to appear.

Twoshorthorizontals'bars-30 and f3 ly are riveted or otherwsegs'ecured i to fthe outersides- `of the spectively, said .fb-ars-;being' disposed in parallel adlocatedequidistantlv ,verdeel-plate 32 isv suitbara; 3I,.1an;d another gear'ff iseseeuredfon 4the other endl -of saidl shaftrA and g located at. the outer sideofthe plate -32. l driving gear 33y meshes with the gear .-31 and is1-:mounted'KJ at 39 up-Qn the plate 32, said driving gear having ,ansyoperating, ycrank .Alli

A dog1 4I Fis cooperablewiththe ratchet wheel outer sidef ofthe ban 3l said dog having a ,tailv t2 instrumental in releasingit. A dogyreleasingshaft43 extends through -theend portions1 ,ofl the bars 3l and` 3'0 opposite theshaft, ,31|i andgis providedon jone, end

4upon this frame.

end of said shaft 43 being formed with an operating handle 45. When this handle is turned in the proper direction, the lug 44 presses downwardly upon the tail 42, thereby releasing the dog 4I from the ratchet wheel 36.

The upper standard section I is tubular and cylindrical and is formed with a longitudinal slot 4E which communicates with the slot 21. The gear 35 extends through both yof these slots and meshes with a vertical rack bar 41 within the standard section Ill. This rack bar abuts diametrically opposite portions of this standard section, at opposite sides of the slot 46, and is secured to said section by rivets or the like shown at 48 in Fig. 3. The standard section Il] has a longitudinal rib 49 secured thereto and slidably received in the slot 28 of the lower standard section 9 to prevent rotation of section I0 with respect to said section 9. A vertically elongated metal strip 50 is secured against the outer side of the rib 49 and contacts slidably with the peripheral portions of the halves 25 of the section 9, adjacent the slot 28. This strip 50 extends through the notch 29' of the collar 29.

It is preferable to secure a suitable handgrip 5l to the plate 32, to be gripped by one hand, to steady the entire device, while operating the crank 40 with the other hand. When this crank is turned clockwise, it drives the gearing to elevate the upper standard section I0, said gearing being locked against retrograde rotation by means of the ratchet wheel 36 and dog 4|, to hold the upper standard section in any upwardly extended position to which it may be raised. When this section is to be again lowered, the dog is released by turning the handle 45 of the shaft 43, the crank 4U being then turned retrogradely. The lower end of the lower standard section 9 is of course open, and the supporting plate I9 is formed with an opening 52 lcommunicating with the interior of said standard section 9, thus permitting the upper section IU to be lowered to a position in which it will project downwardly to some extent from said upper section 9, thereby permitting maximum lowering of the ceiling board supporting frame l I, to facilitate placing 'of a sheet of ceiling board By' having the adjustable legs 8 extend both above and below the base l2 and by making the upper standard longer than the lower standard so that its lower end may extend through the opening 52, an extensive range of vertical adjustment of the frame or platform ll can beobtained. Also by making the vbase l2 of elongated rectangular shape and the frame Il removable, the device may be readily moved through door openings. The particular construction of the device makes it very strong and sturdy, so that it can be used as a scaffold.

From the foregoing, taken in connection withA the accompanying drawings, it will be seen that novel and advantageous provision has been made for attaining the desired end, and while preferences have been illustrated, attention is again invited to the possibility of making variations within the scope of the invention as claimed.

I claim:

l. A ceiling board jack comprising a substantially flat and rectangular base, vertically adjustable legs at the corners of said base, said legs extending through and having their ends extending both above and below said base, means for securing said legs in adjusted positions, a

centrally apertured supporting member carried Itelescoped in the open upper end of said lower standard and having its lower end movable downwardly through said aperture, said upper standard having a longitudinal slot to register with the slot in the lower standard, a ceiling board supporting frame carried by the upper end of said upper standard, and means carried by said lower standard for vertically adjusting said upper standard and securing it in an adjusted position, the last named means comprising a toothed gear rotatably mounted on said upper standard and having a portion projecting through said registering slots, a rack bar lixed within said upper standard and in mesh with said gear, means for rotating said gear and releasable means for holding said gear against rotation in one direction.

2. A ceiling board jack comprising a substantially flat and rectangular base composed of opposed side and opposed end bars having at vertically disposed inner faces, vertically adjustable leg bars at the corners of said base, said leg bars extending through and having their ends extending both above and below said base, said leg bars being of rectangular shape in cross section with flat faces, each of said leg bars having two of its flat surfaces in slidable contact with the flat inner faces of said base bars at a corner of the base, angular clamping yokes engaged with the said flat faces of said leg bars, bolts securing said yokes to the bars of said base to clamp said leg bars against said base bars, a centrally apertured supporting member carried by said base and disposed at its center, a lower hollow standard secured to and rising from said supporting member, the ends vof said standard being open and its open lower end being aligned with said aperture, an upper standard of greater length than said lower standard slidably telescoped in the open upper end of said lower standard and having its lower end movable downwardly through said aperture, a ceiling board supporting frame carried by the upper end of said upper standard, and means carried by said lower standard for vertically adjusting said upper standard and securing it in an adjusted position.

3. A ceiling board jack comprising a base, a lower tubular standard section secured to and projecting upwardly from said base, said lower standard section being composed of two longitudinal halves having their edges spaced apart to provide opposed longitudinal slots, and a collar around and secured to the upper ends of said halves to hold them in spaced relation;

one horizontal bar secured between its ends against the outer side of one of said halves, a second horizontal bar secured between its ends against the outer side of the other of said halves, said bars being located equidistantly below said collar and being disposed at opposite sides of said slots, a shaft extending through said bars at one end of the latter, one gear secured on said shaft at the outer side of one of said bars, a ratchet wheel secured on said shaft at the outer side of the other of said bars, another gear vsecured on said shaft between said bars and e'xtending through one of the aforesaid opposed v5'slots, a vertical plate secured to the outer side said vertical plate and meshing with the afore# said one gear, said driving gear having an operating crank, a dog mounted on said other of said bars and engaging said ratchet wheel to prevent retrograde rotation thereof until released; an upper tubular standard section telescoped within the aforesaid lower section and having ceiling board supporting means, means on said upper standard and slidably engaged with the other of said opposed slots, and a Vertical rack within and connected with said upper section and engaging the teeth of the aforesaid other gear.

4. A ceiling board jack comprising a base, a lower tubular standard section secured to and projecting upwardly from said base, said lower standard section being composed of two longitudinal halves having their edges spaced apart 20 10 tion,

gear extending through said registering slots and mounted on said lower standard section, a rack bar Within and connected with said upper standard section and engaging said gear, a vertical strip secured to the outer edge of said rib and extending substantially throughout the length thereof, said strip being transversely curved and contacting slidably with the outer sides of said halves of said lower standard secsaid collar having an internal notch through which said strip extends and means for driving said gear to elevate and lower said upper standard section. f

IRA SELLERS.

REFERENCES CITED file of this patent:

UNITED STATES PATENTS Number Name Date 122,631 Miller Jan. 9, 1872 831,994 Rudman Sept. 25, 1906 944,560 Joseph Dec. 28, 1909 25 1,417,948 Seska May 30, 1922 1,453,473 McKenna May l, 1923 1,606,101 Russell Nov. 9, 1926 2,337,796 Baker et al. Dec. 28, 1943 

